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Case Reports
. 2014 May;11(2):e11320.
doi: 10.5812/iranjradiol.11320. Epub 2014 May 15.

CT and MR Imaging Characteristics of Intravestibular and Cerebellopontine Angle Lipoma

Ramazan Buyukkaya  1 , Ayla Buyukkaya  2 , Beyhan Ozturk  1 , Huseyin Yaman  3 , Abdullah Belada  3
Affiliations
Case Reports

CT and MR Imaging Characteristics of Intravestibular and Cerebellopontine Angle Lipoma

Ramazan Buyukkaya et al. Iran J Radiol. 2014 May.

Abstract

Intracranial lipoma is an uncommon entity. A rare type of tumor in the internal auditory canal (IAC) and the cerebellopontine angle (CPA) is lipoma. There are a few case reports in the literature related to intravestibular lipoma. Herein, we report a case of lipomas within the cerebellopontine angle and vestibule of the inner ear in a patient with tinnitus and dizziness. The patient was evaluated with a 1.5 T magnetic resonance imaging (MRI) system. MRI and CT showed the masses in the left CPA and the left IAC. These lesions were hyperintense on both T1- and T2 weighted images and showed no enhancement after gadolinium administration. Conservative management was suggested. Histopathological diagnosis is rarely necessary with the widespread use of magnetic resonance imaging. Considering significant morbidity during resection, conservative follow-up is the best approach for CPA and IAC lipoma.

Keywords: Cerebellopontine Angle; Lipoma; Magnetic Resonance Imaging.

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Figures

Figure 1.
Figure 1.
Axial CT images show lipoma as a hypodense lesion in A) the left cerebellopontine angle (HU of -100) and B) the left internal acoustic canal (HU of -182).
Figure 2.
Figure 2.
A, B and C) T1-weighted MRI images show lipoma presenting as hyperintense lesions in the left cerebellopontine angle (black arrows) and the left internal acoustic canal (white arrows).
Figure 3.
Figure 3.
A) Coronal T1-weighted MRI image reveals hyperintense lesions in the left cerebellopontine angle (black arrow) and the left internal acoustic canal (white arrow); B) Coronal T2-weighted fat suppressed image reveals saturated hypointense lesions.
Figure 4.
Figure 4.
A) Axial T1-weighted image shows a hyperintense mass due to lipoma in the left cerebellopontine angle (curved white arrow) and left internal acoustic canal (straight white arrow). B) Axial T1-weighted image with fat saturation displays saturation of lipomas in the left cerebellopontine angle (curved white arrow) and left vestibule (straight white arrow). C) Enhanced axial fat saturation T1-weighted MR image shows no enhancement of lesions
See this image and copyright information in PMC

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